Network problems can be very annoying when they happen. PerfectMail(tm) provides a number of tools to assist administrators in diagnosing network connectivity issues. Available tools include: * DNS LOOKUP - Used to perform DNS Lookups; * PING - U...

The _TraceRoute Tool_ is used to trace the route (path) of network packets travelling between two computers. Similar to the _Ping Tool_, TraceRoute sends ICMP packets from a source computer to a target computer and any intermediate hosts. The IP addres...

The _DNS Lookup Tool_ is used for querying DNS name servers. It performs DNS look-ups and displays the answers that are returned from the name server(s) that were queried. Background An _IP Address_ (Internet Protocol Address) is the addressing mec...

The _Ping Tool_ is used for troubleshooting network connectivity problems. It is used to determining whether one computer can communicate with another computer over a network. If network communication is established, ping can further determine the conn...

The _SMTP Test Tool_ is used to diagnose an _SMTP protocol connection_ between your PerfectMail(tm) server and another mail server. SMTP (S M T P) stands for _Simple Mail Transfer Protocol_. It is the protocol for sending e-mail messages between server...

_Whois_ is a protocol used to display information about networks, domains and Internet hosts in a human readable format. The whois record normally includes data on the organizations and contacts associated with these resources. It may also include info...

_DNS_ (Domain Name Services) is a system that resolves Internet host and domain names into their corresponding IP addresses. The basic DNS mechanism for this resolution is the _A record_. For example, "whitehouse.gov" is really the IP address 23.60.72....

PerfectMail's _Mail Transport Agent_ does a reverse hostname lookup of the IP address of the connecting client, and a lookup of the IP addresses associated with that hostname. If the client IP address does not appear in that list then the "may be forge...

Port 25 (SMTP) traffic needs to be directed to your PerfectMail product should be forwarded to your PerfectMail product from the Internet. It is best to create a one-to-one NAT mapping port 25 on the Internet facing IP address and your PerfectMail p...

Changing DNS records involves a propagation delay that may be as long as 48 hours. After changing your MX records in DNS you cannot tell how long it will be before mail servers will become aware of your new MX record and new mail server. In this 48 hour t...

PerfectMail(tm) provides a number of tools on its web interface (on the "Tools" menu) to provide administrators with the means of easily diagnosing network problems. The following tools are available: * DNS LOOK-UP - Used to perform DNS look-ups; ...

This error message occurs when PerfectMail is unable to resolve the domain name of the sending e-mail address in DNS. Most often this occurs when spammers make up ficticious domain names when sending spam. However, in rare circumstances this can also si...

WARNING: UNABLE TO RESOLVE HOSTS ON THE INTERNET. UNABLE TO RESOLVE HOSTS ON THE INTERNET FOR AT LEAST ONE DNS SERVER! THIS MAY RESULT IN E-MAIL LOSS. PLEASE REVIEW NETWORK SETTINGS AND CORRECT THEM. This message says you are having problems with at...

PerfectMail(tm) may stop accepting e-mail for a number of reasons. Fortunately, PerfectMail runs a periodic validation script that checks for the most likely reasons and displays error messages and warnings on the _PerfectMail Dashboard_. It there is a...

SUMMARY: PerfectMail does not seem to be sending reject messages for unknown users. If a recipient is unknown then the sender should get a rejection message. ANSWER: PerfectMail will always send a Rejection Notification for e-mail addresses that it ...